a bed in a boat, train, etc., or a place for a ship or boat to stay in a port

She booked a berth on the ferry from Palermo to Naples. 她订了一张由巴勒莫开往那不勒斯的渡轮卧铺票。

If a ship or boat berths or if you berth it somewhere, it is tied up and stays in that place.

The ship berthed at Sydney. 轮船停靠在悉尼港。